All are natural. The placement of an adverb is flexible. These are practically the same: I only have a few minutes to talk.
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AnonymousI have only / I only haveThese are nearly always the same in meaning. Many recommend the first, but the second is heard very, very often.
AnonymousI really do not know / I do not really knowThe position of the adverb can make a difference when a negative word like 'not' is present.